The starters on both sides of the ball played the entire first half before coming out of Friday night’s preseason game against San Francisco.

Unlike the preseason opener at New Orleans, the first offensive unit struggled against the NFC champion 49ers. The Chiefs and Alex Smith failed to reach the end zone, as the only scores were a 104-yard kickoff return by Quintin Demps and a pair of field goals by Ryan Succop.

Smith completed seven of 16 passes for 62 yards and was sacked three times.

The defense got off to a rough start, allowing a 52-yard run by Frank Gore on the 49ers’ first offensive play. The defensive highlight was an interception by cornerback Sean Smith, a free-agent signee during the offseason. Another offseason acquisition, linebacker Akeem Jordan, had a sack of Colt McCoy.

San Francisco quarterback Colin Kaepernick played just one series and completed one pass in two attempts for minus-three yards.